It's great to finally have an update! I went for a walk this evening on relatively flat ground. The total elevation ascent and descent are still way off. My 66s reported values of 410 and 433 feet while my Vivoactive 3 posted values of 72 and 75 feet. I was hoping this would be fixed. Max and min elevations were 8484 and 8454 feet over 1.5 miles.

The problem exiting the Recording Controls menu, back to the map screen appears to be fixed.
That used to make the unit turn off for me every time.

It still crashes browsing the map at low zoom levels. Anything from 8km to 20km inclusive if Birdseye imagery is enabled.
Birdseye imagery is not displayed when you zoom out further than 20km printed on the scale.
Where the ordinary Garmin Topo map could crash it before, it appears to only happen for Birdseye imagery now.
I think it would be fixed for now if they simply disabled Birdseye imagery for any view above the 5km zoom level.
At least until the underlying issue is fixed, but it would be better to disable it for those levels than have it turn off.

This is the downloaded highest quality sat imagery. For HEMA raster map product which is also jnx files for Australia,
that is displayed up to 12km zoom level, and doesn’t seem to crash it at all.
Maybe it’s just that it’s the high quality imagery that it can’t handle. The same imagery is used with my 64st and never has a problem, so I’m only comparing to that.

I didn’t get to test much else such as the address search that is said to be fixed.